Th17 cells,
characterised by the production of IL-17A, IL-17F, IL-21,
IL-22, granulocyte-macrophage colony-stimulating factor
(GM-CSF) and CC-chemokine ligand (CCL) 20, have been
identified more recently as an additional subpopulation of
CD4+ T cells involved in host defences against extracellular
microorganisms, including fungi